ip_frag.c File Reference

#include <string.h>
#include "lwip/opt.h"
#include "lwip/ip.h"
#include "lwip/ip_frag.h"
#include "lwip/netif.h"
#include "lwip/stats.h"

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Macros
#define	IP_REASS_BUFSIZE   5760
#define	IP_REASS_MAXAGE   30
#define	IP_REASS_TMO   1000
#define	IP_REASS_FLAG_LASTFRAG   0x01
#define	MAX_MTU   1500

Functions
static struct pbuf *	copy_from_pbuf (struct pbuf *p, u16_t *offset, u8_t *buffer, u16_t len)
void	ip_reass_tmr (void)
struct pbuf *	ip_reass (struct pbuf *p)
err_t	ip_frag (struct pbuf *p, struct netif *netif, struct ip_addr *dest)

Variables
static u8_t	ip_reassbuf [IP_HLEN+IP_REASS_BUFSIZE]
static u8_t	ip_reassbitmap [IP_REASS_BUFSIZE/(8 *8)+1]
static const u8_t	bitmap_bits [8]
static u16_t	ip_reasslen
static u8_t	ip_reassflags
static u8_t	ip_reasstmr
static u8_t	buf [MEM_ALIGN_SIZE(MAX_MTU)]

Macro Definition Documentation

IP_REASS_BUFSIZE

#define IP_REASS_BUFSIZE   5760

IP_REASS_FLAG_LASTFRAG

#define IP_REASS_FLAG_LASTFRAG   0x01

IP_REASS_MAXAGE

#define IP_REASS_MAXAGE   30

IP_REASS_TMO

#define IP_REASS_TMO   1000

MAX_MTU

#define MAX_MTU   1500

Function Documentation

copy_from_pbuf()

static struct pbuf* copy_from_pbuf ( struct pbuf *  p, u16_t *  offset, u8_t *  buffer, u16_t  len  )

static

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ip_frag()

err_t ip_frag	(	struct pbuf *	p,
		struct netif *	netif,
		struct ip_addr *	dest
	)

Fragment an IP datagram if too large for the netif.

Chop the datagram in MTU sized chunks and send them in order by using a fixed size static memory buffer (PBUF_ROM)

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ip_reass()

struct pbuf* ip_reass

(

struct pbuf *

p

)

Reassembles incoming IP fragments into an IP datagram.

Parameters

p	points to a pbuf chain of the fragment

Returns

NULL if reassembly is incomplete, ? otherwise

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ip_reass_tmr()

void ip_reass_tmr

(

void

)

Reassembly timer base function for both NO_SYS == 0 and 1 (!).

Should be called every 1000 msec.

Variable Documentation

bitmap_bits

const u8_t bitmap_bits[8]

static

Initial value:

= { 0xff, 0x7f, 0x3f, 0x1f,
 0x0f, 0x07, 0x03, 0x01
}

buf

u8_t buf[MEM_ALIGN_SIZE(MAX_MTU)]

static

ip_reassbitmap

u8_t ip_reassbitmap[IP_REASS_BUFSIZE/(8 *8)+1]

static

ip_reassbuf

u8_t ip_reassbuf[IP_HLEN+IP_REASS_BUFSIZE]

static

ip_reassflags

u8_t ip_reassflags

static

ip_reasslen

u16_t ip_reasslen

static

ip_reasstmr

u8_t ip_reasstmr

static